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Ch B Chemistry
Discovering Atomos Lesson 3
| Question | Answer |
|---|---|
| element | a specific form of matter composed of only one type of atom, classified by the number of protons in an atom of that element |
| Periodic Table of the Elements | a system of organization for the elements, with elements positioned based on their atomic number and type |
| atomic number | the number of protons in an atom |
| periods | a row in the Periodic Table; determined by the highest energy level where electrons can be found in an atom of taht elmenet |
| groups | the name for a column in the Periodic Table of Elements, generally divided based on the number of valence electrons in an atom of the element |
| metals | the most abundant of the three broad categories into which elements are classified based on their properties; are good conductors of electricity, can be molded or stretched without breaking |
| non-metals | one of the three broad categories into which elements are classified based on their properties; in solid form, do not gleam, are poor conductors, and tend to be fragile |
| metalloids | one of three broad categories of the Periodic Table; also called semimetals or semiconductors; sometimes have a metallic gleam, but are more fragile; can conduct heat and electricity, but not as well as metals. |
| atomic mass | the total average number of protons and neutrons in an atom |
| isotope | a variation of an element based on the number of neturons in its nucleus |
| 13 Al 27 | Aluminum |
| 14 Si 28 | Silicon |
| 15 P 31 | Phosphorus |
| 16 S 32 | Sulphur |
| 17 Cl 35 | Chlorine |
| 18 Ar 40 | Argon |
| 19 K 39 | Potassium |
| 20 Ca 40 | Calcium |